Root-canal-filling dental injector.



P. R. SKINNER;

ROOT GANAL FILLING DENTAL INJECTOR.

APPLICATION FILED APR.17, 1908.

Patented May 11, 1909.

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PERRY R. sKm En'oE AMSTERDAM, NEW YORK.

ROOT-GANAL-FILLING DENTAL INJECTOR.

To all whom it may concern:

Be it known that I, PERRY R. SKINNER, a citizen of the United States, residing at Amsterdam, in the county of Montgomery and State of New York, have invented certain new and useful Improvements in Root- Canal-Filling Dental injectors, of which the following is a specification.

My invention relates to dentistry and the object of my invention is to provide an injector by which antiseptic dental paste may be injected in the root canal of a tooth, without getting the material upon the hand of the op erator. I accomplish this object by means of the mechanism illustrated in the accompanying drawings, in which: 7

Figure 1 is a side elevation of my dental injector. Fig. 2 is a part plan and cross section on lines AA, Fig. 1. Fig. 3 is a cross section on lines BB Fig. 1., Fig.4 is an end view of Fig. 1.

Similar numerals refer to similar parts throughout the several views. I

The object of my invention is to provide a means by which antiseptic dental paste may be readily inserted in the small root canals of the teeth without inconvenience. To, do this I rovide a holder 1, in which an ordinary lexible tube of dental paste may be placed. 2 represents such a tubeof paste. This holder 1 is provided with a smooth channel adapted to' hold such a tube of pasty medical pre aration as is usually used b dentists to 1 such canals. This holder has a ring, 14, or other device,.suitable to take hold of with the hand in using it.

13 is the handle upon which the holder 1 rests and which slides in the slot 4 and has the rim or finger piece 14 for the operator to use. The handle 3 has a forked end 15, suitable to hold the end of the stem 7.

5 is a plunger of any desired form located within the tube of paste and embedded in the paste slightly back of the cap in such a position that the movement of the plunger'mixes the paste and the forward movement of the plunger will force the paste from the flexible tube into the cap and through the insertion tube 10 hereinafter described;

6 is a coil spring around the stem 7 of the plunger, one end of the spring operates against the back of the pocket of the plunger and the other end against the s oulder formed by the cap of the tube. The handle 14 imparts motion to the plunger by drawing out'the stem 7 and compressing the spring.

Specification of Letters Patent.

Application filed April 17, 1908. Serial No. 427,694.

which the stem of the Patented May 1 1, 1909.

The spring returns the lunger to place when the pressure is removed 8 is a thumb piece fitting over the holder and the handle ofthe injector and having a diagonal back adapted to press against the lower end of the tube containing the paste and so arranged as to slide along said holder so that the operator can press his thumb against the scraper or thumb piece 8, and thus kee the paste firmly pressed against the cap 01 the tube, and as the paste becomes usedup in said: tube the thumb piece 8 can be pushed along and the end of the tube next the cap be kept full.

Uponthe screw head of the tube of paste I place the cap 9 having the small insertion tube 10 connected therewith. The tube 10 is small enough to be inserted in the root.

canal cavity, and forms an opening from the cap ofthe paste tube for the paste to pass ,into the cavity of the tooth.

11 is a packing box or stufiing box through lunger passes. I insert the back of the p unger containing the coil spring into the end of the tube containing the paste so that the stem 7 of the lunger 5 extends out through the end 0 the tube. I then place the cap 9 over the stem of the plunger and screw it nrmly to the tube.

'The paclring-box or stufiing box is over the stem of the plunger and is fastened against the cap so as to allowjthe stem of the plunger to work through it but it is so packed that it will not allow the paste to pass out through the end around the stem. I make the end of the stem of the lunger with a notch and shoulder 16, to fit mto the fork 15 of the handle 3. The tube 10 connects with the inner part of the cap 9.

The operation of my injector is as follows; When put together as above described the injector is taken by the hand of the operator and the insertion tube 10 is inserted in the opening of the cavity of the tooth. The thumb piece or ring, 14, of the handle, 3, is then pressed. toward the ring or thumb piece 13, of the holder 1. This will press out- .wardly the fork 15 of the handle 3 carrying the stem 7 of the plunger 5. This will move the plunger which is embedded in the paste outward toward. the cap 9. This will so press the'paste into the cap 9 as to force it through the tube 10 into the root-canal where desired. When the pressure is removed from the handle 3 the spring 6 will return the plunger to place and remove the pressure from the paste in the tube 10, so that the flow of the paste will cease with the removal of the pressure.

Constructed in this way my injector is always ready for use, is easy of operation and may bequickly used without the operator getting his hands sticky or mussy from the paste. Also as at present used the )aste is usually mixed with a spatulator on g ass for each separate operation. W hen so used the operator gets more or less of the paste on the cavity walls and on the teeth, from which it must be carefully cleaned. The paste contains oil which prevents adhesion of the filling to the Walls of the cavity and also the oil in the ordinary tube when allowed to stand collects ahead of the paste, but with my injector the plunger thoroughly mixes the paste in the tube for each operation and the insertion tube uses just the amount needed and thoroughly mixes as needed for each operation.

What I claim as my invention and desire to secure by Letters Patent is:

1. An injector for inserting dental paste in the root-canal of a tooth, consisting of a holder adapted to contain a flexible tube of soft paste, a cap adapted to fit upon the open end of said flexible tube, an insertion tube connected with the interior of said cap and adapted to be inserted in the root-canal of the tooth, means for pressing the paste in said flexible tube into said cap and from said cap through said insertion tube into the cavity of the tooth, substantially as described.

2. In an injector for inserting dental paste in the root-canal of a tooth, a flexible tube ada ted to contain soft paste, a cap adapted to ht upon the end of said tube, an insertion tube connected with the interior of said cap and adapted to be inserted in the opening in the tooth, a holder adapted to contain said flexible tube, a plunger el'nbedded in the soft paste in said tube, a handle adapted to be operated longitudinally with said holder, said handle having one end extending beyond said cap, a stern connected with said plunger on one end and extending through said cap and adapted to be operated by said handle at the other end, whereby the operation of said handle will mix the paste in said tube and force the same into said cap and through said insertion tube, substantially as described.

in the root-canal of a tooth, a flexible tube adapted to contain soft paste, a holder adapted to contain said flexible tube, a bandle slidably connected to said holder, a plunger embedded in the soft paste in said flexible tube, a cap attached to the end of said flexible tube, an insertion tube connected with the interior of said cap and adapted to be inserted in said root-canal, a stem extending through said cap attaching said plunger to said slidable handle whereby the sliding of said handle outwardly will force paste from said flexible tube into said cap and through said insertion tube, a thumb piece mounted.

slidably upon said holder behind said, flexible 3:

tube and adapted to bear against the closed end of said flexible tube, thereby forcing the paste in said flexible tube to the open end thereof, substantially as described for the purposes set forth.

In testimony whereof I allix my signature in presence of two witnesses.

PERRY R. SKIN NE R.

Witnesses A. R. Conovnn, BURTON Frsnnn.

O. In an injector for inserting dental paste 

